Field Controls 7MG1 Gas Fired Furnace/Boiler Draft Control

Gas Fired Furnace/Boiler Draft Control; Type Draft Control, Double Acting; Used On Gas Fired Furnace and Boiler; Overall Dimension 7-5/8 Inch Outer Diameter; Control Size 7 Inch; Nominal Capacity 38.5 Square Inch; Circumference 19 to 22 Inch; Material Thickness 22 Gauge (Ring/Gate), 26 Gauge (Collar); Approval UL (Canada and US), CSA